Oracle JDK vs. OpenJDK: Differences Explored
Despite the suggestion in the question that Oracle JDK and OpenJDK were distinct entities in 2014, the two offerings have since come under a single umbrella. Oracle is now responsible for the maintenance of both implementations.
Implementation Details
OpenJDK and Oracle JDK adhere to the same Java specification, evidenced by their compliance with the Java Technology Certification Kit (TCK). This means that both implementations should execute Java code identically.
Garbage Collection
The garbage collection mechanisms employed by OpenJDK and Oracle JDK are identical. They both feature the same algorithms, parameters, and optimizations. As such, the behavior and performance of garbage collection will be consistent across both implementations.
License and Commercial Support
The primary difference between OpenJDK and Oracle JDK lies in their licensing models. OpenJDK is open source and free to use under the GNU General Public License (GPL). Oracle JDK, on the other hand, requires commercial licensing for access to long-term support (LTS) versions.
With the advent of JDK 11, Oracle introduced a licensing requirement for commercial use of its LTS JDK. This means that organizations using Oracle JDK for production environments will need to purchase a subscription to continue receiving updates and support.
In conclusion, while Oracle JDK and OpenJDK share the same underlying implementation, they differ in their licensing models. For those seeking free and open-source options, OpenJDK remains the ideal choice. However, organizations requiring commercial support and guaranteed long-term maintenance should consider Oracle JDK.
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